linux-kernel - [RFC PATCH 2/2] dt-bindings: cpufreq: Document Krait CPU Cache scaling

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Message-Id: <20200805131200.3234-3-ansuelsmth@gmail.com>
Date:   Wed,  5 Aug 2020 15:11:59 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Ansuel Smith <ansuelsmth@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Rob Herring <robh+dt@...nel.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 2/2] dt-bindings: cpufreq: Document Krait CPU Cache scaling

Document dedicated Krait CPU Cache Scaling driver.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 .../bindings/cpufreq/krait-cache-scale.yaml   | 89 +++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/cpufreq/krait-cache-scale.yaml

diff --git a/Documentation/devicetree/bindings/cpufreq/krait-cache-scale.yaml b/Documentation/devicetree/bindings/cpufreq/krait-cache-scale.yaml
new file mode 100644
index 000000000000..190276ba035a
--- /dev/null
+++ b/Documentation/devicetree/bindings/cpufreq/krait-cache-scale.yaml
@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/cpufreq/krait-cache-scale.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Krait Cpu Cache Frequency Scaling dedicated driver
+
+maintainers:
+  - Ansuel Smith <ansuelsmth@...il.com>
+
+description: |
+  This Scale the Krait CPU Cache Frequency and optionally voltage
+  when the Cpu Frequency is changed (using the cpufreq notifier).
+
+  Cache is scaled with the max frequency across all core and the cache
+  frequency will scale based on the configured threshold in the dts.
+
+  The cache is hardcoded to 3 frequency bin, idle, nominal and high.
+
+properties:
+  compatible:
+    const: qcom,krait-cache
+
+  clocks:
+    description: Phandle to the L2 CPU clock
+
+  clock-names:
+    const: "l2"
+
+  voltage-tolerance:
+    description: Same voltage tollerance of the Krait CPU
+
+  l2-rates:
+    description: |
+      Frequency the L2 cache will be scaled at.
+      Value is in Hz.
+    items:
+      - description: idle
+      - description: nominal
+      - description: high
+
+  l2-cpufreq:
+    description: |
+      Threshold used by the driver to scale the L2 cache.
+      If the max CPU Frequency is more than the set frequency,
+      the driver will transition to the next frequency bin.
+      Value is in kHz
+    items:
+      - description: idle
+      - description: nominal
+      - description: high
+
+  l2-volt:
+    description: |
+      Threshold used by the driver to scale the L2 cache.
+      If the max CPU Frequency is more than the set frequency,
+      the driver will transition to the next frequency bin.
+      Value is in microvolt.
+    items:
+      - description: idle
+      - description: nominal
+      - description: high
+
+  l2-supply:
+    description: Phandle to the L2 regulator supply.
+
+required:
+  - compatible
+  - clocks
+  - clock-names
+  - voltage-tolerance
+  - l2-rates
+  - l2-cpufreq
+  - l2-supply
+  - l2-volt
+
+examples:
+  - |
+    qcom-krait-cache {
+      compatible = "qcom,krait-cache";
+      clocks = <&kraitcc 4>;
+      clock-names = "l2";
+      voltage-tolerance = <5>;
+      l2-rates = <384000000 1000000000 1200000000>;
+      l2-cpufreq = <384000 600000 1200000>;
+      l2-volt = <1100000 1100000 1150000>;
+      l2-supply = <&smb208_s1a>;
+    };
-- 
2.27.0